Question about Cisco CVA 122 (CVA122-SINGLE-1P) Modem

1 Answer

Cisco cva 122

I want to open port/gate 21 for a ftp server at my home but the cisco is blocking my acces..

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  • Steve Rand
    Steve Rand May 11, 2010

    Is "the cisco" actually YOUR Cisco router?



    If so, do you have a username and password to configure it?



    If so, let me know and we can hook you up.

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  • 31 Answers

PAT/NAT has to be configured to forward port 21 to your PC's IP address.
Have you had a look in the config/management page? If it supports this, it'll be there...

Posted on Feb 23, 2010

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Posted on Jan 02, 2017

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1 Answer

WHAT ARE THE PORT RANGES FOR ADDRESSES


Usable tcp and udp ports range from 1 to 65535. However you should not need to open any ports by default. Most routers include a stateful packet inspection (SPI) firewall. This is a fancy way of saying the router inspects the packet on it's way out to the internet when a computer on the inside of the firewall sends it out to the internet. The firewall will only allow connections from the internet on that TCP or UDP port if it returns from the original destination. For example, if you send a packet requesting the web page at cisco.com, the firewall will only allow traffic back into your network on TCP port 80 from the web server at cisco.com. If a packet from any other IP address tries to piggyback into your network through tcp port 80, the firewall will block it.

The only reason to open ports on your firewall is to allow a server inside your network to receive unsolicited traffic e.g. a web server inside your network may need TCP port 80 and 443 (HTTP and HTTPS) opened if you want to be able to access it from the internet. A mail server may need port 25 and 110 open for SMTP/POP e-mail. However, most home users do not host their own mail or web servers.

Mar 22, 2014 | Cisco Linksys Refurbished E3000...

1 Answer

Ftp protocol work out of 21 port


Hello John! It may be because your ISP firewall is detecting FTP protocols activity and it blocks it (doesn't matter the port number). Anyway, maybe you can try to use FTPS, a secure extension for this protocol. That way the connection will be encrypted and (maybe) your ISP wont flag it

Mar 21, 2017 | Computers & Internet

1 Answer

URI: res://ieframe.dll/httpErrorPagesScripts.js Code: 0 Line: 264 Char: 5


When I connect to my FTP site, I use ftp://thenameofit.com

I do not need to put the port in. Perhaps you can try something like that. I'm using Windows 10, and satellite internet. I have had 3 different satellite providers, and none allow me to open ports. So possibly you do not need to do it, either.

Dec 25, 2017 | Microsoft Internet Explorer 8

2 Answers

How can I block *all* torrents traffic with a Cisco 5540 ASA firewall. It consuming too much bandwidth


Hi there,

Well you can use the torrent software to not allowing more bandwidth, just open the torrent software (utorrent, bittorrent etc....) right click on the downloading file then goto the bandwidth allocation menu and select low bandwidth, just do this with all of the downloading things......

Good Luck!!

Thanks

Jan 07, 2010 | Computers & Internet

2 Answers

Cannot FTP at all behind Thomson tg585v7


Hi, your router will by default block all incoming packets from outside. You need to configure a firewall rule to allow tcp port 20 and 21 from outside and specify that it must be sent to the IP address of the pc running the FTP server software. Also make sure that your FTP server and firewall on the pc allows these ports in by checking your firewall on your pc.

Oct 10, 2009 | Computers & Internet

1 Answer

FTP problems.


There are 2 ports used for FTP. They are 20 and 21. When you initiate a connection that occurs on port 21, but data traffic is on port 20. Your firewall sees your outside FTP server trying to 'initiate' a connection on port 20 and breaks the connection to that IP address.
What you need to do is either use 'passive' ftp or open both ports 20 and 21 for ftp traffic in the firewall.

Apr 02, 2008 | D-Link DFL-800 Firewall

1 Answer

RCA Modem DCM315R


Just a bit of explanation. E0 interface is for inside network (LAN interface). E1 is for outside (ISP or WAN physical interface). Dialer1 is for PPPoE (the "actual"/logical WAN interface). The 1.0.0.13 is ISP provided static IP address for the use of the server. This configuration example is for running FTP server, which uses the standard TCP port 20 and 21.

The LAN uses 10.10.10.0 network with 255.255.255.0 subnet for both servers and workstations. All servers within the LAN use static IP address. The router is configured as DHCP server to give out IP info (IP addresses, subnet mask, DNS) to workstations that are configured as DHCP client.

Basically I suggest that you deploy NAT (Network Address Translation) and PAT (Port Address Translation) to setup your own servers behind Cisco router. The NAT is used to translate the ISP's given static IP address to your local IP address. The PAT is used to translate TCP ports (the port 20 and 21) between the two IP addresses.

When using NAT/PAT, keep in mind that the Internet-accessible servers are seen from the Internet as their NAT/PAT-ed IP address (the Public IP address) and not the local IP address (not the Private IP address). This understanding is very important when you or someone need to test connectivity to the server and/or when you need to create filter (access list or ACL for short) to allow only certain incoming traffic from the Internet and block others.

Side Note:
For more info on NAT/PAT concept, check out the following FAQ
»Cisco Forum FAQ »NAT and PAT; Introduction and Implementations

Instruments used in this illustration are pretty much standard for running your own servers. Please note that IP addresses, username, and password are changed. However, you could always modify the configuration to suit your situation.

This sample configuration assumes that you have a block of IP from ISP. There is a dedicated Public IP address for the router WAN interface (the Dialer1 interface) and another dedicated Public IP address for the server PAT IP address. If you only have a single Public IP address for both router WAN interface and server PAT IP address, there are several ways to configure the router.

One way is to use the same command as shown in sample configuration.

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  1. ip nat source static tcp 10.10.10.2 21 1.1.1.14 21 extendable
ip nat source static tcp 10.10.10.2 21 1.1.1.14 21 extendable
This one configuration way is suitable when you have static IP address from your ISP and you know exactly what the IP address is. In this case you have the 1.1.1.14 single static IP address for both the WAN interface and Public server IP address.

When you are unsure which IP address you receive from the ISP, or when your Public IP address keep changing; then another way to configure the static PAT is following

view plaincopy to clipboardprint?
  1. ip nat source static tcp 10.10.10.2 21 interface Dialer1 21 extendable
ip nat source static tcp 10.10.10.2 21 interface Dialer1 21 extendable
With situation of dynamic IP address, at some point you still need to know the exact Public IP address you receive from your ISP for server connection testing and production time. To find out, you can issue show ip interface brief command on the router. You will then see the associated WAN interface Public IP address.

Feb 25, 2008 | RCA Cable Modem DCM315R (11603540)

2 Answers

Port Forwarding


Port forwarding is a method that allows you to run a server behind the router. Port Forwarding opens a specific port to a computer behind the router, allowing all Incoming Traffic on that port to be sent directly to that server. It should be used to setup servers behind the router, typically Port Triggering (Answer ID 344) is a better choice for non server applications (Such as instant messengers and game servers). Below is an example of how to setup Port Forwarding. For our example we will be setting an FTP Server and a Mail Server that uses SMTP and POP3. FTP uses ports: 20 and 21 SMTP uses port: 25 POP3 uses port: 110 Getting Started 1. You must set a static IP address on the server. If you're unsure of how to do this please go to Answer ID 534 for information on setting a static IP address in Windows. 2. Once the static IP address has been assigned please go to your desktop and double click on Internet Explorer (Located on the Start Menu in Windows XP) 3. Once "Internet Explorer" opens, please type http://192.168.1.1into the "Address Bar" and click GO 4. The "Enter Network Password" window will appear. Skip user name and type admin (admin is the default password) as the password, and click OK 5. This will bring up the routers "Setup" section. Look under "Domain Name" and check what version of the firmware you're using. 6. You will need to click on the Advanced tab to the very right. Once the "Advanced" tab comes up please go to the Forwarding tab. Firmware prior to 1.32 This will not work with firmware prior to 1.32

Feb 16, 2006 | Linksys EtherFast Cable/DSL Router

1 Answer

Port Forwarding


Port forwarding is a method that allows you to run a server behind the router. Port Forwarding opens a specific port to a computer behind the router, allowing all Incoming Traffic on that port to be sent directly to that server. It should be used to setup servers behind the router, typically Port Triggering (Answer ID 344) is a better choice for non server applications (Such as instant messengers and game servers). Below is an example of how to setup Port Forwarding. For our example we will be setting an FTP Server and a Mail Server that uses SMTP and POP3. FTP uses ports: 20 and 21 SMTP uses port: 25 POP3 uses port: 110 Getting Started 1. You must set a static IP address on the server. If you're unsure of how to do this please go to Answer ID 534 for information on setting a static IP address in Windows. 2. Once the static IP address has been assigned please go to your desktop and double click on Internet Explorer (Located on the Start Menu in Windows XP) 3. Once "Internet Explorer" opens, please type http://192.168.1.1into the "Address Bar" and click GO 4. The "Enter Network Password" window will appear. Skip user name and type admin (admin is the default password) as the password, and click OK 5. This will bring up the routers "Setup" section. Look under "Domain Name" and check what version of the firmware you're using. 6. You will need to click on the Advanced tab to the very right. Once the "Advanced" tab comes up please go to the Forwarding tab. Firmware prior to 1.32 This will not work with firmware prior to 1.32 Firmware between 1.32 and 1.36 Service Port Range 20 ~ 21 25 ~ 25 110 ~ 110 IP Address 192.168.1.3 192.168.1.3 192.168.1.3 Firmware after 1.36 up to 1.40m Service Port Range 20 ~ 21 25 ~ 25 110 ~ 110 Protocol Both Both Both IP Address 192.168.1.3 192.168.1.3 192.168.1.3 Firmware after 1.40m Customized Application FTP SMTP POP3 Service Port Range 20 ~ 21 25 ~ 25 110 ~ 110 Protocol Both Both TCP IP Address 192.168.1.3 192.168.1.3 192.168.1.3 Finishing up Click Apply, then Continue Restart your computer

Feb 16, 2006 | Linksys EtherFast Cable/DSL Router

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